<wicket:extend xmlns:wicket="http://wicket.apache.org">
    <a class="menu-toggler" id="menu-toggler" href="#">
        <span class="menu-text"></span>
    </a>
    <div class="sidebar" id="sidebar">
        <div wicket:id="menu"/>
    </div>

    <div class="main-content">
        <div class="page-content">
            <div class="row">
                <div class="col-xs-12">
                    <wicket:child/>
                </div>
            </div>
        </div>
    </div>
</wicket:extend>